Coil transducer for elevated temperatures

Abstract

A coil transducer (200) for elevated temperatures is provided. The coil transducer (200) includes a coil portion (210) including a coil (212), the coil (212) being comprised of a conductive wire (212a), and an electrical insulator disposed proximate the conductive wire (212a). The coil (212) is configured to have a repeatable electrical property over a temperature range that is greater than 350 C.

1 . A coil transducer ( 200 ) for elevated temperatures, the coil transducer ( 200 ) comprising:
 a coil portion ( 210 ) including a coil ( 212 ), the coil ( 212 ) being comprised of a conductive wire ( 212   a ); and   an electrical insulator disposed proximate the conductive wire ( 212   a );   wherein the coil ( 212 ) is configured to have a repeatable electrical property over a temperature range that is greater than 350° C.   
     
     
         2 . The coil transducer ( 200 ) of  claim 1 , wherein the coil ( 212 ) being configured to have the repeatable electrical property over the temperature range that is greater than 350° C. comprises at least one of:
 the conductive wire ( 212   a ) and the electrical insulator being thermal-expansion compatibles of each other over the temperature range; 
 the electrical insulator being substantially non-conductive over the temperature range; and 
 the conductive wire ( 212   a ) having a substantially repeatable conductivity over the temperature range. 
 
     
     
         3 . The coil transducer ( 200 ) of  claim 2 , wherein the conductive wire ( 212   a ) and the electrical insulator being thermal-expansion compatibles of each other comprises the conductive wire ( 212   a ) and the electrical insulator having substantially equal coefficients of thermal expansion. 
     
     
         4 . The coil transducer ( 200 ) of  claim 2 , wherein the conductive wire ( 212   a ) having a substantially repeatable conductivity over the temperature range comprises the conductive wire ( 212   a ) having a substantially repeatable conductivity over a plurality of temperature cycles including at least a portion of the temperature range. 
     
     
         5 . The coil transducer ( 200 ) of  claim 4 , wherein each of the plurality of temperature cycles includes the temperature range. 
     
     
         6 . The coil transducer ( 200 ) of  claim 1 , wherein the electrical insulator comprises a ceramic coating ( 212   b ) on the conductive wire ( 212   a ). 
     
     
         7 . The coil transducer ( 200 ) of  claim 1 , wherein the electrical insulator comprises a bobbin ( 214 ), and the coil ( 212 ) is disposed around the bobbin ( 214 ). 
     
     
         8 . The coil transducer ( 200 ) of  claim 7 , wherein the conductive wire ( 212   a ) and at least one of the bobbin ( 214 ) and the ceramic coating ( 212   b ) are thermal-expansion compatibles of each other. 
     
     
         9 . The coil transducer ( 200 ) of  claim 1 , wherein the conductive wire ( 212   a ) comprises a magnetic material. 
     
     
         10 . The coil transducer ( 200 ) of  claim 1 , wherein the conductive wire ( 212   a ) comprises a material that includes one of nickel, a nickel alloy, a platinum-rhodium alloy, a platinum-iridium alloy, and a niobium-tantalum-tungsten alloy. 
     
     
         11 . The coil transducer ( 200 ) of  claim 1 , wherein the temperature range is one of from 350° C. to 500° C., from 350° C. to 427° C., from 410° C. to 500° C., and from 410° C. to 427° C. 
     
     
         12 . The coil transducer ( 200 ) of  claim 1 , further comprising a magnet portion ( 220 ), the magnet portion ( 220 ) being configured to spatially displace relative to the coil portion ( 210 ). 
     
     
         13 . A method of forming a coil transducer for elevated temperatures, the method comprising:
 forming a coil portion including a coil, the coil being comprised of a conductive wire;   disposing an electrical insulator proximate the conductive wire; and   configuring the coil to have a repeatable electrical property over a temperature range that is greater than 350° C.   
     
     
         14 . The method of  claim 13 , wherein configuring the coil to have the repeatable electrical property over the temperature range that is greater than 350° C. comprises at least one of:
 configuring the conductive wire and the electrical insulator to be thermal-expansion compatibles of each other over the temperature range; 
 configuring the electrical insulator to be substantially non-conductive over the temperature range; and 
 configuring the conductive wire to have a substantially repeatable conductivity over the temperature range. 
 
     
     
         15 . The method of  claim 14 , wherein configuring the conductive wire and the electrical insulator to be thermal-expansion compatibles of each other comprises configuring the conductive wire and the electrical insulator to have substantially equal coefficients of thermal expansion. 
     
     
         16 . The method of  claim 14 , wherein configuring the conductive wire to have a substantially repeatable conductivity over the temperature range comprises configuring the conductive wire to have a substantially repeatable conductivity over a plurality of temperature cycles including at least a portion of the temperature range. 
     
     
         17 . The method of  claim 16 , wherein each of the plurality of temperature cycles includes the temperature range. 
     
     
         18 . The method of  claim 13 , wherein disposing the electrical insulator proximate the conductive wire comprises disposing a ceramic coating on the conductive wire. 
     
     
         19 . The method of  claim 13 , wherein disposing the electrical insulator proximate the conductive wire comprises forming a bobbin and disposing the coil around the bobbin. 
     
     
         20 . The method of  claim 19 , wherein configuring the conductive wire and the electrical insulator to be thermal-expansion compatibles of each other comprises configuring the conductive wire and at least one of the bobbin and the ceramic coating to be thermal-expansion compatibles of each other. 
     
     
         21 . The method of  claim 13 , wherein the conductive wire comprises a magnetic material. 
     
     
         22 . The method of  claim 13 , wherein the conductive wire comprises a material that includes one of nickel, a nickel alloy, a platinum-rhodium alloy, a platinum-iridium alloy, and a niobium-tantalum-tungsten alloy. 
     
     
         23 . The method of  claim 13 , wherein the temperature range is one of from 350° C. to 500° C., from 350° C. to 427° C., from 410° C. to 500° C., and from 410° C. to 427° C. 
     
     
         24 . The method of  claim 13 , further comprising forming a magnet portion and configuring the magnet portion to spatially displace relative to the coil portion. 
     
     
         25 . A vibratory meter ( 5 ) for elevated temperatures, the vibratory meter ( 5 ) comprising:
 a meter electronics ( 20 );   a meter assembly ( 10 ) communicatively coupled to the meter electronics ( 20 ), the meter assembly ( 10 ) comprising:
 at least one conduit ( 103 A,  103 B); 
 a driver ( 104 ) coupled to the at least one conduit ( 103 A,  103 B); and 
 at least one pickoff ( 105 ,  105 ′) coupled to the at least one conduit ( 103 A,  103 B); 
 wherein at least one of the driver ( 104 ) and the at least one pickoff ( 105 ,  105 ′) comprise a coil transducer ( 200 ), the coil transducer ( 200 ) comprising:
 a coil portion ( 210 ) including a coil ( 212 ), the coil ( 212 ) being comprised of a conductive wire ( 212   a ); and 
 an electrical insulator disposed proximate the conductive wire ( 212   a ); 
 wherein the coil ( 212 ) is configured to have a repeatable electrical property over a temperature range that is greater than 350° C. 
 
   
     
     
         26 . The vibratory meter ( 5 ) of  claim 25 , wherein the coil ( 212 ) being configured to have the repeatable electrical property over the temperature range that is greater than 350° C. comprises at least one of:
 the conductive wire ( 212   a ) and the electrical insulator being thermal-expansion compatibles of each other over the temperature range; 
 the electrical insulator being substantially non-conductive over the temperature range; and 
 the conductive wire ( 212   a ) having a substantially repeatable conductivity over the temperature range.